vista b2 64b hp install hangs

So i downloaded Windows Vista Beta 2 64bit from the MSDN site and started a clean installation onto my HP Workstation xw6200 last night. When I came in this morning it was still sitting at the screen with the green progress bar and "northern lights" background. I assumed the installation had "hung" so I relaunched only to find my self in the exact same place about 4 hours later. So my question is how long should this installation take? Is the install hanging? Any reasons why? Anyone else seen this issue? Recomendations? Thanks